Furnace wall



July 29, 1930. D. s. JAcoBus 1,771,850

' FURNACE WALL Filed March 9, 192's 2 Sheets-Sheet 1 IINIVENTOR' Y. WATTORNEY-8' July 29, 1930. s, co us 1,771,850

FURNACE WALL Filed March 9, 1926 2- Sheets-Sheet 2 Fig; 5 Fig: (5 v ll IL. 30 l W 27 hp 32 an 32 e6 H sl a5 {35 35 WI'MW QL I 1 E INVENTORPatented July 29, 1930 UNITED STATES PATENT o ncE 7 DAVID s. JACOBUS, orMONTCLAIR, NEW JERSEY, ASSIGNOR, BY MnsNE ASSIGNMENTS, ,TO FULLERLEHIGHcoMrANY,-A CORPORATION or DELAWARE FURNACE wALL Application filed Karel1,9, 1926. Serial No. 93,410.

This invention relates to a. furnace espe cially adapted for boilers,and will be understood from the description in connection with theaccompanying drawings, in'Wh-ichFig. l

is a vertical section throughthe furnace and boiler; Figs. 1*- and 1 aresimilar sections, broken away, showing details; Fig. 2 1s a sectionalong the line 22 of Fig. 1; Figi 3 "is a enlarged side elevationshowing one of the details; In the drawings, reference characters 10 and11 indicate the front and rear a cross header 21, from walls of afurnace, the furnacebeing surrounded by a casing 13. One of the sidewalls of the furnace is shown at 14, and the furnace is provided withfuelburners 15 for oil or ulverized coal, although it is to beunderstood that the invention is not restricted to this particular sortof burner, as stokers, for example, may be used. A boiler of the Babcock& Wilcox type is shown disposed above the furnace with horizontallyinclined tubes 16, terminating in headers '17 which are, in turn,connected to the steam and water drum 18. A tube 19 leads from the drum18 to a header 19, from which slag screen tubes 20 lead through sleeves.20 in the front wall 10 of the furnace, and these slag screen tubesmerge into water cooling wall tubes21, which extend upwardly along theinside of the wall 11- of the furnace, and then outwardly into which apipe 22 leads to the drum 18.

In the illustrative embodiment, the walls of the furnace comprisewedge-shaped blocks 25 (Fig. 3), of highly refractory material havingvertical grooves 26 in thesides thereof. Metallic holding members 27have bulbed portions 28 which fit into the grooves 26 to hold the tile25 in place. The ends of the bulbed portions 28 are tapered, as shown at29 8), to prevent the edges of the tile from being caught as the sameare moved up and down. Angle irons 30 are providedto which the holdingmembers 27 are attached and the joints.

in anyconvenient manner, as by riveting or bolting the same thereto.Wedge-shaped intermediate tile 31 are located 'on arcs of circlesbetween pairs of tile 25 to form a plurality 'of'arches with theirsoflits forming the inner side of the wall,-and these tile 31 may be ofcheaper or less strong material than the tile 25. Metal backing plates32 are disposed between the angle irons '30 and are secured thereto inany convenient manner. These backing plates 32 contact with the verticalfaces of the tile 31-, which faces form .the backs of the arches, andretain the tile in place. They may be made thin enough to besufficiently flexible to spring out and into take care of the expansion,even when their edges are rigidly attached to the angle irons 30, or,this attachment may be by other suitable means which will permit acertain amount of play, if desired. The above arrangement results in theformation of a plurality of non-structural arches, and by thisexpression I mean arches which are-not relied upon as. structural archesto support'a load,

whether that load consists of the dead load of the arch itself, or anadditional load. imposed upon the arch.

The casing 13 surrounds the wall of the furnace, and is spaced a shortdistancetherefrom, .so as to provide air passages between the furnacewall proper and the casing itself.

Supporting T-bars 33 have angle irons 34 attached thereto, and spacingstraps 35 are connected between the angle irons 30 and 34:. The casing13 may be made up of flanged lates 36 and 37 that are attached to the-bars 33, and are spaced apart slightly, the space therebetween beingfilled with heat insulating material 38.' The joints between the and thecasing 13. A fan 43 draws air from the conduits 42 and forces the samethrough the conduit 44 and downwardly rear wall of the furnace andbthecasing 13, through the space 45 below the furnace, and upwardly betweenthe front wall 10 and the casing 13, through the openings 46 into thefurnace. Openings 47 rovided with doors 48 may be provided at t e loweredges of the furnace for removing ashes therefrom.

The portion of the furnace wall at the rear that is cooled by the watertubes 21 is most clearly shown in Figs. 2 and 7 in which the water tubes21 are shown connected to the holdin members 27' as by autogenouswelding 21 for example. The tile 25 are held between the tubes 21 andthe flanges of the holding'members 27, and the tile '31 are re-' tainedbetween the pairs of tile 25 by means of the metal plates 32, as alreadydescribed.

The operation is as follows: Cooling air enters the spaces at the loweredges of the furnace between the side walls 14 and the casing 13, andpasses upwardly, as indicated by the dotted arrows in Fig. 1, into theconduits 42, from which it is drawn by. the fan 43 and forced into thehorizontal conduit 44, from whence it passes downwardly between the rearwall 11 and the casing 13, under the furnace through the channel 45, andthence upwardly between the front wall 10 and the casing 13, through theopenings 46 into the furnace. V

The tile 25 and 31 are free to expand vertically as the tile 25 arepermitted to slide along the bulbed portions 28 of the holding members27. Horizontal expansion is also provided for, since the tile 31"ai'earranged on arcs of circles and the plates 32 may bend outwardly a shortdistance. It will, there fore, not be necessary to provide for expansionof the tile from side to side of the wall, as local expansion in eachsection is provided for.

Various changes and modifications can be made in the details withoutdeparting from the spirit or scope of the invention.

I claim: I

1. In a furnace wall, spaced holding members and a plurality of tiledisposed between said members and forming a plurality of archestherebetween, each arch being substantially unrestrained from outwardmovement and having its soffit forming the inner side of the wall,flexible means disposed between said members and contacting with theback of said arches to retain said tile in position, and a casing wallspaced outwardly from said arches to form an air space between thearches and the casing wall.

2. In a furnace wall, spaced holding members and a plurality of tiledisposed between said members and forming a plurality of archestherebetween, each arch being substantially unrestrained from outwardmovement and having its soffit forming the inner side of the wall, aplurality of flexible plates between the disposed between said membersand contact ing with the back of said arches to-retain said tile inposition, and a casing .spaced from said plates and forming therewith aspace for the passageof a fluid.

3. In a furnace wall,-spaced holding members and a plurality of tiledisposed between said members and forming a plurality of non-structuralarches therebetween, eaclr arch having its soflit forming the inner sideof the wall, and a plurality of flexible plates disposed between saidmembers and contacting with the back of said arches to retain said tilein position. v

4. In a furnace wall, spaced holding members and a plurality of tiledisposed between said members and forming a plurality of nonstructuralarches therebetween, each arch having its soflit forming the inner sideof the Wall, and a plurality of water tubes disposed on the inside ofsaid wall and secured to said holding members.

5. In a furnace wall, spaced holding members and a plurality of tiledisposed between said members and forming a plurality of nonstructuralarches therebetween, each arch having its sofiit forming the inner sideof the wall, and a plurality of water tubes disposed on the inside ofsaid wall and secured to said holding members, said water tubes havingsliding engagement with the tile adjacent thereto and holding said tilein position.

6. A furnace wall comprising inner and outer portions spaced aparttoform an air space therebetween, said inner portion comprising spacedholding members, and a In rality of tile disposed between said mem ersand forming a. plurality. of arches therebetween, each arch having itssoflit forming the inner side of said inner portion andbeingsubstantially unrestrained from outward movement into said space.

7 A furnace wall comprising inner and outer portions spaced apart toform an air 'space therebetween, said inner portion comprising spacedholding members, a plurality of tile disposed between said members andforming a plurality of arches therebetween, each arch having its sofiitforming the inner side of said inner portion and being substantiallyunrestrained from outward movement into said space, and flexible meansextending between said members and contacting with the backs of saidarches to retain said tile in position.

DAVID S. JACOBUS.

